摘要:
The present invention relates to a lapping oil composition which is advantageously used in finish-grinding of a material to provide a high-quality grinding surface, without selective grinding, which is generally caused during lapping and polishing processes of the composite material. The lapping oil composition contains at least one acetylene glycol compound and preferably further contains at least one at least one phosphoric ester compound.
摘要:
Disclosed is a method of polishing a magnetic head slider whereby a by-processed step can be easily reduced. An air bearing surface of the magnetic head slider is polished with setting a bar that includes the magnetic head slider where a thin film magnetic head element is formed to reciprocate in a radius direction of a polishing plate, as well as rotating the polishing plate having a polishing surface. Polishing steps include a first polishing step of performing a height polish while rotating the polishing plate at a first velocity, and a second polishing step of performing a finishing polish while rotating the polishing plate at a second velocity sufficiently lower than the first velocity. The second velocity at the second polishing step is set so that an average linear velocity in the direction of the rotation of the polishing plate is equal to or lower than 0.032 m/s (preferably equal to or lower than 0.008 m/s). Consequently, the by-processed step that is generated on the air bearing surface of the magnetic head slider is reduced.
摘要:
The present invention relates to a free abrasive slurry composition which is advantageously used in uniform grinding of a composite material composed of a plurality of materials each having different hardness, without causing selective grinding. The free abrasive slurry composition contains abrasive particles, an anti-abrasion agent as an anti-selective grinding agent and a dispersion medium and the anti-abrasive agent is a compound containing one or both of sulfur and phosphorus or hydroxyl group(s) in the molecular chain.
摘要:
It is intended to provide a pyrrole-imidazole polyamide type functional molecule having enhanced abilities of alkylating DNA and recognizing a sequence, compared with the existing functional molecules of this type, for a specific base sequence occurring on DNA. A hairpin polyamide having an alkylation site via a vinyl linker at the end of a pyrrole-imidazole polyamide. Drugs for inhibiting the expression of a specific gene and anticancer agents containing the above hairpin polyamide.
摘要:
A compound represented by formula (1): wherein R1 is a substituent represented by formula (2): wherein R2 is ═O or —NH2, with the proviso that when R2 is ═O, H is attached to the 1-position N of the pyrimidine ring, and the bond between the 1-position N and the 6-position C is a single bond; or a substituent represented by formula (3): wherein R3 is —OH, ═O, or —NH2, with the proviso that when R3 is —OH or —NH2, R4 is H; when R3 is ═O, R4 is —NH2; and when R3 is ═O, H is attached to the 1-position N of the purine ring, and the bond between the 1-position N and the 6-position C is a single bond.
摘要:
A process for amino acid derivatives shown by the below general formula (I): (wherein R1 means a hydrogen atom or a straight chain or branched chain alkyl group with 1-5 carbon atoms.) having an object to provide a process of the amino acid derivatives of the formula (I) and their synthetic intermediate, t-butoxycarbonylamino-ethylamine, whereby it requires no tedious procedure and is also good in yield, and its application to a mass production is easy, and to provide novel amino acid derivatives of the formula (IV), their synthetic intermediates, and a process thereof, characterized in that it comprises a step to obtain the amino acid derivatives shown by the general formula (I) by hydrolysis of compounds shown by the below formula (II): (wherein R1 has the same meaning as described above, and R2 means a straight chain or branched chain alkyl group with 1-4 carbon atoms.) as well as amino acid derivatives shown by the general formula (IV): (wherein R1 means a hydrogen atom or a straight chain or branched chain alkyl group with 1-5 carbon atoms, and n means any one of integers 1-11.), and a process for the amino acid derivative, characterized in that it comprises a reduction step of benzyloxycarbonyl-ω-amino acid derivatives.
摘要:
The invention provides a compound recognizing the minor group of hydrogen bonds between base pairs and being capable of forming a covalent bond with bases. The inventive compound can recognize a specific nucleotide sequence and can strongly bind to adjacent bases via covalent bonding, to regulate the expression of a DNA with the nucleotide sequence. The invention provides a DNA alkylating agent comprising a compound represented by the general formula I: wherein R represents a lower amyl group or a polyamide group; and X represents nitrogen or CH.
摘要:
A magnetic playback apparatus and method with which a PLL phase-locked to played-back data operates stably even when the magnetic tape on which the data is recorded is transported at a high speed of several hundred times the recording speed. During high-speed playback of a magnetic tape, the speed of the magnetic tape is detected and using this tape speed information the free-run frequency of a PLL 2 is corrected in correspondence with the azimuth angles of magnetic heads HO, HE. The rotational period of a drum servo 3 is also corrected using the tape speed information.
摘要:
An anti-piracy signal generating circuit for generating anti-piracy signal components on a video signal reproduced by a first video unit, the signal components being interleaved to a frequency f.sub.H in the band of the video signal in accordance with the video signal components and a signal superimposing circuit for superimposing the anti-piracy signal components intermittenly on the luminance signal, first color difference signal, and second color difference signal.
摘要:
A luminance signal Y and two color difference signals (R-Y), (B-Y) are separated from a color video signal. A color difference time division multiplex (TDM) signal is produced from the two color difference signals by a time base compression and time base multiplexing. A burst signal is added on the luminance signal and the color difference TDM signal as a time base information. The color difference TDM signal is recorded on an inner area of a disc. The luminance signal which has a wide signal band is recorded on an outer area of a disc which has a good frequency response characteristic. By separate recording of the two kinds of signals, a high resolution is obtained.